Ethylene-C4-C20-alkene copolymers

a technology of alkene and copolymer, applied in the field of ethylenec4c20alkene copolymer, can solve the problems of difficult molds, high cost, and inability to meet the requirements of high thermal stability, and achieve the effects of easy formation, high thermal stability, and good wear resistan

Inactive Publication Date: 2005-05-19
CORNELL RES FOUNDATION INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0007] It has been discovered herein that ethylene-C4-C20-alkene copolymers can be prepared with low polydispersities and / or predominantly cis-1,2-enchainment which in some cases are advantageous substitutes for ultra high molecular weight polyethylenes, in other cases are useful for gas barrier coatings and in still other cases are advantageous substitutes for polypropylenes and have higher thermal stability than polypropylenes.
[0008] In one embodiment herein, denoted the first embodiment, the invention is directed at copolymers of ethylene and C4-C20-alkene (where the alkene is an alpha-olefin or monocyclic olefin), containing from 0.1 to 50 mol percent of said alkene with the remainder being ethylene, with said alkene units being 50 to 100% isolated, i.e., not adjacent another said alkene unit, e.g., 70 to 100% isolated, the copolymers having a number average molecular weight ranging from 10,000 to 2,700,000 g / mol and having a polydispersity less than 1.3 when the alkene is a linear alkene, and having a polydispersity less than 2.0, preferably less than 1.6, very preferably, less than 1.3 when the alkene is a monocyclic alkene. The copolymers of the first embodiment are advantageous substitutes for ultra high molecular weight polyethylenes, for example, for coatings on the bottom of skis and for hip replacement implants and have the good wear resistance of ultra high molecular weight polyethylenes and are more easily formed.

Problems solved by technology

This material has the disadvantage that it is almost intractable and is difficult to mold and needs to be machined or sintered.
Polypropylenes while useful for many applications are not useful for applications requiring high thermal stability, e.g. for producing molded auto engine parts.

Method used

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  • Ethylene-C4-C20-alkene copolymers

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first embodiment

[0018] Copolymers of the first embodiment differ from those disclosed in Natta, G., et al, Makromol. Chem 54, 95-101 (1962) at least in the polydispersity limitation.

second embodiment

[0019] We turn now to the invention herein.

[0020] The monocyclic alkenes can be, for example, any of those named in the description of the first embodiment. Copolymers of ethylene and cyclopentene of the second embodiment were made using the conditions of said Table 1, but with less cyclopentene. Samples made in this way and their properties are set forth in the table below where CP means cyclopentene, Tm means melting temperature (differential scanning calorimeter run at 10° C. / min with the melting points reported being for the second heating run), Mn being number average molecular weight and PDI meaning polydispersity.

TABLESamplemol % CPTm(° C.)Mn (g / mol)PDI10.8125.1791 k1.7521.7123.9418 k1.6533.0114.6987 k1.32

third embodiment

[0021] We turn now to the invention herein.

[0022] Copolymer of the third embodiment can be made as described in Fujita, M., et al, Macromolecules 35, 9640-9647 (2002) by ring opening metathesis polymerization of cicyclo[3.2.0]hept-6-ene using 2,6-diisopropylphenylimedoneophylidene [rac-BIPHEN] molybdenum VI, which is available from Strem. The catalyst complex in CH2Cl2 (1 mL) is added to monomer (M) solution and reaction is carried out using 8.5 micromol catalyst (C) and [M] / [C] ratio of 450 and 1 minute time. The resulting polymer (0.20-0.25 g) is dissolved in toluene with 4 to 5 g of p-toluene sulfonhydrazide and 0.05 g 2,6-di-tert-butyl-p-cresol and after refluxing for 9 hours, the reaction provided isotactic perfectly alternating copolymer of ethylene and cyclopentene having a number average molecular weight of 21 1,000 g / mol, a polydispersity of 1.55 and Tg of 17.0° C. and Tm of 181.6° C. as determined by 13C NMR. The copolymer contains no 1,3-units of cyclopentene, i.e., only ...

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Abstract

Poly (ethylene-co-C4-C20-alkene) copolymers or segments with polydispersities less than 1.3 and/or predominantly enchainment in a cis-1,2 fashion and/or poly(ethylene-co-C4-C20 monocyclic alkene) copolymers or segments provide in some cases substitutes for ultra high molecular weight polyethylenes and in some cases substitutes for polypropylenes and in some cases utility as gas barrier coatings.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS [0001] This application claims the benefit of U.S. Provisional Patent Application No. 60 / 519,626, filed Nov. 14, 2003.[0002] This invention was made at least in part with United States Government support under United States National Science Foundation Materials Research Science and Engineering Centers program DMR-0079992. The United States Government has certain rights in the invention.TECHNICAL FIELD [0003] This invention relates to ethylene-C4-C20-alkene copolymers. BACKGROUND OF THE INVENTION [0004] Ultra high molecular weight polyethylenes are used, for example, as wear-resistant layers on the bottom of skis and as hip replacement implants. This material has the disadvantage that it is almost intractable and is difficult to mold and needs to be machined or sintered. [0005] Polypropylenes while useful for many applications are not useful for applications requiring high thermal stability, e.g. for producing molded auto engine parts. [0006] E...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C08F210/02
CPCC08F210/02C08F232/00C08F2500/03
Inventor COATES, GEOFFREY W.FUJITA, MASAYUKI
Owner CORNELL RES FOUNDATION INC
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